/* 清除默认样式 */
* {
    margin: 0;
    padding: 0;
}
a {
    text-decoration: none;
}
ul {
    list-style: none;
}
input {
    border: 0;
    outline: none;
}
.clearfix::after {
    display: block;
    clear: both;
    content: "";
    height: 0px;
    visibility: hidden;
}
.md {
    width: 990px;
    margin: 0 auto;
}
.left {
    float: left;
}
:root {
    --fontSize: 14px;
    --bannerW: 650px;
}
/* 内容区域 */
.article {
    background: #f4f6f6
        url("https://news.tsinghua.edu.cn/dfiles/20186/publish/thunews/images/bg_02.jpg")
        center top no-repeat;
    padding: 40px 0 100px 0;
}
.article .column1 {
    width: 650px;
}
.article .column2 {
    width: 290px;
    margin-left: 50px;
}
/* swiper */
.banner {
    width: var(--bannerW);
}
.banner .swiper-container {
    height: 400px;
    position: relative;
    /* 设置按钮颜色 */
    --swiper-navigation-color: #fff;
    /* 设置按钮大小 */
    --swiper-navigation-size: 18px;
}
.banner .swiper-container img {
    width: 100%;
}
.banner .swiper-container .imgInfo {
    position: absolute;
    height: 150px;
    background: rgba(0, 0, 0, 0.4);
    z-index: 100;
    left: 0;
    bottom: 0;
    padding: 25px 35px;
    box-sizing: border-box;
}
.banner .swiper-container .imgInfo a {
    display: block;
    color: #fff;
    font-size: calc(var(--fontSize) + 4px);
    margin-bottom: 25px;
}
.banner .swiper-container .imgInfo p {
    font-size: var(--fontSize);
    color: #ddd;
}
.banner .swiper-container .swiper-button {
    background-color: rgba(0, 0, 0, 0.6);
    width: 40px;
    height: 58px;
    margin-top: -29px;
    font-weight: bold;
}
.banner .swiper-container .swiper-button-prev {
    left: 0;
}
.banner .swiper-container .swiper-button-next {
    right: 0;
}
.banner .swiper-pagination {
    position: relative;
    padding: 5px 5px;
    background: #413d4b;
}
.banner .swiper-pagination-bullet {
    width: 25%;
    background: none;
    height: auto;
    /* opacity: 1; */
}
.banner .swiper-pagination-bullet img {
    border: 3px solid #413d4b;
    box-sizing: border-box;
    width: calc(var(--bannerW) / 4);
    height: 100%;
}
.banner .swiper-pagination-bullet-active img {
    border-color: #f4930a;
}
/* 新闻图片列表 */
.picNews {
    padding-top: 45px;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
}
.picNews li {
    width: 200px;
    height: 280px;
    background: #fff;
    margin-bottom: 20px;
    overflow: hidden;
}
.picNews a {
    display: block;
    width: 100%;
}
.picNews img {
    width: 100%;
    max-height: 125px;
}
.picNews img:hover {
    transform: scale(1.2);
    transition: all 0.5s linear;
}
.picNews .title {
    font-size: 16px;
    font-weight: normal;
    padding: 20px 25px 0;
    height: 60px;
    line-height: 20px;
    overflow: hidden;
    text-overflow: ellipsis;
}
.picNews .title:hover {
    color: #ff7800;
}
.picNews .thumb {
    margin: 30px 0 0 10px;
    font-size: 12px;
    color: #999;
}
.picNews .thumb i {
    font-size: 14px;
    margin: 0 3px 0 15px;
}
.picNews .thumb i:first-of-type {
    color: #ff7800;
    font-weight: bold;
}
.article .page {
    display: flex;
    width: 100%;
    justify-content: center;
}
.article .page li{
    border: 1px solid #ccc;
    padding: 5px 8px;
    margin-right: 5px;
    height: 24px;
    line-height: 12px;
    box-sizing: border-box;
    cursor: pointer;
}
.article .page li.current{
    background: #461b6e;
    color: #fff;
}
.side {
    position: fixed;
    right: 100px;
    top: 50px;
    display: none;
}